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After several tests it looks like problem occurs only with Office 2003 files and Windows Explorer when there is also a new directory involved.
Eg. I made a new directory and saved a new excel file to the new directory, then i tried open it in Windows Explorer. File didn't open every time, maybe every second. BUT then I made a new file to OLD directory and i opens without problem.

This problem occurs in several laptops not only one :(
New ideas how to fix this?